EP0729637B1 - Disjoncteur electrique a gaz comprime - Google Patents

Disjoncteur electrique a gaz comprime Download PDF

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Publication number
EP0729637B1
EP0729637B1 EP94931508A EP94931508A EP0729637B1 EP 0729637 B1 EP0729637 B1 EP 0729637B1 EP 94931508 A EP94931508 A EP 94931508A EP 94931508 A EP94931508 A EP 94931508A EP 0729637 B1 EP0729637 B1 EP 0729637B1
Authority
EP
European Patent Office
Prior art keywords
compression
piston
armature
gas
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94931508A
Other languages
German (de)
English (en)
Other versions
EP0729637A1 (fr
Inventor
Klaus-Peter Rolff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0729637A1 publication Critical patent/EP0729637A1/fr
Application granted granted Critical
Publication of EP0729637B1 publication Critical patent/EP0729637B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/882—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts the movement being assisted by accelerating coils

Definitions

  • the invention relates to an electric pressure gas switch with at least one fixed contact piece and a switching element that can be moved by a drive, with a compression device with a compression piston and a compression cylinder, of which at least one is displaceable by the drive from an on position while reducing a compression space that is limited by the drive , and with an armature which is axially movable by the magnetic field of a stator which can be excited by a shutdown current, the armature being mechanically connected to a drive piston which delimits a compression chamber, and the armature and stator are arranged in such a way that the magnetic field has an armature movement already in the switched-on position of the compression device causes.
  • At least one fixed contact piece can be connected to a connecting piece, if necessary, via a switching piece that can be moved by a drive.
  • a compression device with a compression piston and a compression cylinder surrounds the existing arc space between the contact piece and connector.
  • the compression piston is displaced relative to the compression cylinder, the compression space delimited by them being reduced in order to generate an extinguishing gas flow.
  • an armature is attached via a rod connected to the compression piston.
  • the armature which is formed as part of the piston rod and is made of ferromagnetic material, reaches the effective range of the magnetic field of a stator that is excited by a breaking current. At this moment the compression piston is accelerated in the opposite direction to the movement of the compression cylinder and causes an extinguishing gas pressure increase during the switch-off process.
  • a known (DE-A1-40 10 006) variant of a drive support by the magnetic effect of the switch-off current contains at least one armature attached to the compression cylinder, which plunges into a slot of a yoke during the switch-off process after a partial movement distance of the compression cylinder and supports the compression cylinder movement from this point in time.
  • the object of the invention is to provide a gas pressure switch which, with a comparatively small required stroke of the compression cylinder, enables the arc to be blown with a relatively high initial quenching gas pressure.
  • An important advantage of the invention is that a short-circuit or shutdown current that occurs generates the axial movement of the armature even before the switch is triggered, in the switched-on position of the compression device.
  • a considerable pressure builds up in the compression chamber, which acts on the side of the compression piston which is remote from the compression space.
  • the compression piston thereby moves towards the compression cylinder, so that the compression space delimited by them is reduced in advance.
  • a considerably increased initial pressure builds up in the compression space before the drive starts the actual switch-off process.
  • the increased initial pressure of the quenching gas has an advantageous effect on the blowing of the arc igniting during the shutdown process.
  • the stroke of the compression cylinder can be made shorter accordingly. Depending on the design of the compression chamber, such a high excess pressure can be generated in it that the subsequent switch-off movement of the compression cylinder is supported.
  • the stator is a coil.
  • the coil consists of a section of a connector, the wall of which is traversed by a helically wound radial slot.
  • the gas pressure switch has a fixed contact piece 1 and a connector piece 2 coaxially opposite it at a fixed distance.
  • the contact piece and the connector piece can be electrically connected via a movable contact piece 3.
  • the switching piece is connected via a switching rod 5 and a drive fork 6 to a mechanical drive 7, not shown in detail.
  • the contact piece 3 is firmly connected to a compression cylinder 8.
  • the latter delimits a compression space 12 of the compression device 14 with an axially displaceable compression piston 9 with a packing 10 arranged thereon.
  • the compression cylinder 8 is also connected to the drive 7 via the shift rod 5.
  • Figure 1 shows the compression cylinder 8 in the switched-on position 16, in which the switching piece 3 is in a position connecting the contact piece 1 with the connecting piece 2.
  • an armature 20 which is arranged in the interior 21 of the rear extension 22 of the connecting piece 2 so as to be axially slidably insulated.
  • the armature 20 is made of ferromagnetic material and is connected to a drive piston 24 via a connecting rod 23.
  • a positioning spring 25 ensures - provided there are no further forces acting on the armature 20 - that the armature is shown above the center line in FIG. 1.
  • the continuation 22 of the connecting piece 2 is designed as a stator 26 in the form of a coil 27, in that a section 28 of the connecting piece 22 is traversed in its wall by a continuous, helically wound radial slot 29. The turns are well insulated from each other.
  • the drive piston 24 delimits a compression chamber 30, which communicates via an overflow pipe 31 with a volume V1 between a guide part 32 and the side 33 of the compression piston 9 facing away from the compression space 12.
  • a tension spring 34 which is fixed at one end to the open end of the overflow pipe 31 facing the compression chamber 30 and is fixed at its other end to a stop guide 35 (FIG. 6).
  • the tension spring 34 serves as a positioning spring in order to bring the compression piston into the rest position shown in the upper half of FIG. 1.
  • the stator 26 When the load current (short-circuit current or cut-off current) rises significantly above the rated current, the stator 26 generates a magnetic field, the strength of which is sufficient to pull the armature 20 arranged next to it into the coil 27 against the force of the spring 25 (lower half of FIG. 1, the cutting plane of which 90 ° with respect to the upper half as shown in Figure 1). Due to the associated movement of the drive piston 24, the compression chamber 30 is significantly reduced, so that the compression chamber pressure p k increases significantly. The pressure increase in the compression chamber acts on the side 33 of the compression piston 9 via the overflow pipe 31. The compression piston moves towards the compression cylinder 8, whereby the volume V1 increases and at the same time the compression space 12 is reduced to the volume V2.
  • the pressure in the compression space 12 increases considerably. If a maximum permissible rated current (cut-off current or short-circuit current) is exceeded, the switch then opens and the drive moves the compression cylinder 8 in the direction of arrow A.
  • the contact piece 3 runs off the fixed contact piece 1, it ignites Arc between contact piece 1 and switching piece 3. Due to the increased initial pressure of the extinguishing gas in volume V2, the arc is particularly strongly blown at the beginning, which has an advantageous effect on the extinguishing process. Due to the extinguishing gas initial pressure, which is increased in advance by utilizing the overcurrent energy, and the compression piston 9, which is moved in advance, that of Compression cylinder stroke to be performed drive be reduced accordingly. As illustrated in FIG.
  • the advance movement of the compression cylinder can be limited by a longitudinal groove 40 as a stop guide.
  • the compression piston can also be locked in the advanced position.
  • the pressure in the volume V1 can still be so high that the subsequent compression cylinder movement is supported by the pressure acting on the further cover plate 42 (FIG. 2) of the guide part 32.
  • the bottom of the guide part 32 contains an end plate 42 with at least one valve 43 (FIGS. 2, 4).
  • the valve includes spring-loaded guide pins 45.
  • the filler body 10 and the compression piston 9 form a unit which can slide in a gas-tight manner in the axial direction on the guide part 32 (FIG. 1) and with respect to the compression cylinder 8 and contain at least one valve 50 (FIGS. 3 and 5) (representations enlarged in each case).
  • the covers 52, 53 of the valves 43, 50 are closed before the movement begins.
  • the guide pins 45 of the valve 43 press against the cover 53 of the valve 50.
  • the valve 50 locks the volume V2 by means of a built-in spring 54 against overflow of extinguishing gas from the volume V2 into the volume V1. Accordingly, extinguishing gas is compressed in the volume V2, while the volume V1 to be enlarged is filled via the valve 43.
  • the compression device 14 is, as explained above, before the movement begins the compression chamber 30 has already been reduced and a corresponding pressure in the volume V1 has been built up via the overflow pipe 31. Because of the pressure in the volume V1, both valves 43, 50 remain closed on their covers 52, 53 (the cover 53 rests on the surface 55) and the compression piston 9 is advanced against the restoring force of the spring 34 as described above while reducing the volume V2 .
  • the armature 20 is pushed back into a rest position by the spring 25 and latched there if necessary.
  • the latch is released by the fork 6 again only when the switch-on position 16 is reached, in order to prevent a pressure build-up which makes the switch-on movement more difficult when the switch is made to a short circuit via the compression chamber 24.
  • valve 43 When the compressed gas switch is switched on, the valve 43 is closed.
  • the pressure built up in the volume V1 opens the valve 50 against the closing force of its springs, so that extinguishing gas can flow from the decreasing volume V1 into the volume V2 which increases during switching on.
  • the valve 50 is only brought into its closed position against the force of the spring 54 by the guide pins 45 of the valve 43 when the switch-on position 16 is reached.

Landscapes

  • Circuit Breakers (AREA)

Abstract

Dans un disjoncteur à gaz comprimé comportant un dispositif de compression (14) pourvu d'un piston (9) et d'un cylindre de compression (8), un au moins de ces éléments pouvant être déplacé, lors de la coupure du circuit, par un dispositif d'entraînement (7) à partir de la position de mise en circuit (16) en réduisant l'espace de compression (12) limité par ces éléments, la pression initiale du gaz d'extinction est augmentée en raison du fait que le piston (9) est d'abord amené contre le cylindre de compression (8). Afin d'exploiter, pour ce mouvement, l'effet magnétique du courant de coupure, un induit (20) peut être mis en mouvement par le champ magnétique d'un stator (26) excitable par le courant de coupure, cet induit générant - par l'intermédiaire d'une chambre de compression (30) - une pression provoquant l'avancée initiale du piston de compression (8).

Claims (3)

  1. Disjoncteur électrique à gaz comprimé
    - comprenant au moins une pièce fixe de contact (1) et une pièce de commutation (3) mobile au moyen d'un entraînement (7) ;
    - un dispositif de compression (14) présentant un piston de compression (9) et un cylindre de compression (8) parmi lesquels au moins l'un peut être déplacé à partir d'une position d'enclenchement (16) lors du processus de déclenchement, par le biais de l'entraînement (7), avec diminution d'une chambre de compression (12) qu'ils délimitent ; et
    - un induit (20) pouvant être déplacé, dans le sens axial, par le champ magnétique d'un stator (26) excitable par un courant de rupture,
    l'induit (20) étant relié mécaniquement à un piston d'entraînement (24) qui délimite un compartiment de compression (30), et l'induit (20) et le stator (26) étant agencés de telle sorte que le champ magnétique provoque un mouvement de l'induit dès la position d'enclenchement (16) du dispositif de compression (14),
    caractérisé par le fait que
    la face (33) du piston de compression (9), tournée à l'opposé de la chambre de compression (12), est soumise à la pression (pk) régnant dans le compartiment de compression, de façon telle qu'un accroissement de la pression dans le compartiment de compression provoque un mouvement du piston de compression (9) en direction du cylindre de compression (8).
  2. Disjoncteur à gaz comprimé selon la revendication 1,
    caractérisé par le fait que
    le stator (26) est une bobine (27).
  3. Disjoncteur à gaz comprimé selon la revendication 2,
    caractérisé par le fait que
    la bobine (27) est constituée d'une partie (28) d'une pièce de raccordement (22), dont la paroi est traversée par une fente radiale (29) s'enroulant en hélice.
EP94931508A 1993-11-19 1994-10-27 Disjoncteur electrique a gaz comprime Expired - Lifetime EP0729637B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4339923 1993-11-19
DE4339923A DE4339923A1 (de) 1993-11-19 1993-11-19 Elektrischer Druckgasschalter
PCT/DE1994/001298 WO1995014303A1 (fr) 1993-11-19 1994-10-27 Disjoncteur electrique a gaz comprime

Publications (2)

Publication Number Publication Date
EP0729637A1 EP0729637A1 (fr) 1996-09-04
EP0729637B1 true EP0729637B1 (fr) 1997-07-09

Family

ID=6503248

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94931508A Expired - Lifetime EP0729637B1 (fr) 1993-11-19 1994-10-27 Disjoncteur electrique a gaz comprime

Country Status (6)

Country Link
US (1) US5742016A (fr)
EP (1) EP0729637B1 (fr)
JP (1) JPH09505180A (fr)
CA (1) CA2176954A1 (fr)
DE (2) DE4339923A1 (fr)
WO (1) WO1995014303A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19629475A1 (de) * 1996-07-10 1998-01-15 Siemens Ag Druckgasleistungsschalter
DE19745550A1 (de) * 1997-10-10 1999-04-15 Siemens Ag Druckgasleistungsschalter
DE10355535B4 (de) * 2003-11-27 2009-08-27 A. Raymond Et Cie Vorrichtung zum abgedichteten Verbinden von zwei Endstücken

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3549842A (en) * 1966-11-21 1970-12-22 Westinghouse Electric Corp Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means
US3745281A (en) * 1970-02-20 1973-07-10 Hitachi Ltd Gas-blast circuit breaker having a floating puffer piston driven by electromagnetic force
DE2319836C3 (de) * 1973-04-17 1981-12-24 Hitachi, Ltd., Tokyo Leistungsschalter
US4041263A (en) * 1975-08-22 1977-08-09 General Electric Company Electric circuit interrupter of the puffer type comprising a magnetically actuated piston
CH594977A5 (fr) * 1976-03-29 1978-01-31 Bbc Brown Boveri & Cie
CH594281A5 (fr) * 1976-05-24 1978-01-13 Bbc Brown Boveri & Cie
DE3141324C2 (de) * 1981-10-17 1986-02-06 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau Leistungsschalter
DE3231169A1 (de) * 1982-08-21 1984-02-23 BBC Aktiengesellschaft Brown, Boveri & Cie., 5401 Baden, Aargau Blaskolbenschalter
DE4010006A1 (de) * 1990-03-26 1991-10-02 Siemens Ag Elektrischer druckgasschalter
DE4010007A1 (de) * 1990-03-26 1991-10-02 Siemens Ag Druckgasleistungsschalter mit antreibbarem kompressionskolben

Also Published As

Publication number Publication date
US5742016A (en) 1998-04-21
DE4339923A1 (de) 1995-05-24
WO1995014303A1 (fr) 1995-05-26
JPH09505180A (ja) 1997-05-20
DE59403330D1 (de) 1997-08-14
EP0729637A1 (fr) 1996-09-04
CA2176954A1 (fr) 1995-03-26

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